[WebAssembly] Add WebAssembly::Specifier

Move wasm-specific members outside of MCSymbolRefExpr::VariantKind (a
legacy interface I am eliminating). Most changes are mechanic and
similar to what I've done for many ELF targets (e.g. X86 #132149)

Notes:

* `fixSymbolsInTLSFixups` is replaced with `setTLS` in
  `WebAssemblyWasmObjectWriter::getRelocType`, similar to what I've done
  for many ELF targets.
* `SymA->setUsedInGOT()` in `recordRelocation` is moved to
  `getRelocType`.

While here, rename "Modifier' to "Specifier":

> "Relocation modifier", though concise, suggests adjustments happen during the linker's relocation step rather than the assembler's expression evaluation. I landed on "relocation specifier" as the winner. It's clear, aligns with Arm and IBM’s usage, and fits the assembler's role seamlessly.

Pull Request: https://github.com/llvm/llvm-project/pull/133116

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp b/llvm/lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp
index 8d4d271..7bee4af 100644
--- a/llvm/lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp
+++ b/llvm/lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp
@@ -14,6 +14,7 @@
 ///
 //===----------------------------------------------------------------------===//
 
+#include "MCTargetDesc/WebAssemblyMCExpr.h"
 #include "MCTargetDesc/WebAssemblyMCTypeUtilities.h"
 #include "TargetInfo/WebAssemblyTargetInfo.h"
 #include "llvm/BinaryFormat/Wasm.h"
@@ -238,7 +239,7 @@ MCDisassembler::DecodeStatus WebAssemblyDisassembler::getInstruction(
         auto *WasmSym = cast<MCSymbolWasm>(Sym);
         WasmSym->setType(wasm::WASM_SYMBOL_TYPE_FUNCTION);
         const MCExpr *Expr = MCSymbolRefExpr::create(
-            WasmSym, MCSymbolRefExpr::VK_WASM_TYPEINDEX, getContext());
+            WasmSym, WebAssembly::S_TYPEINDEX, getContext());
         MI.addOperand(MCOperand::createExpr(Expr));
       }
       break;